Method of lifting or lowering an object by means of a plurality of so-called climbing jacks

Abstract

A method of lifting or lowering of an object by means of a plurality of climbing jacks capable to climb each along a climb rod. The method comprises the steps of staying the rods slidably by means of associated support structures, arranging each rod on a jack, which jacks are held separated from each other from a load point of view, and adjusting the height position of the climb rods in relation to each other by means of the respective jack in order to minimize the stresses in the object caused by the lifting operation.

I claim: 
     
       1. A method of lifting or lowering an object on a mast structure by means of a plurality of climbing jacks capable of climbing each along a climb rod, comprising the steps of: mounting the rods to the mast on associated support structures to allow relative movement between the rod and the mast, arranging each rod on a jack associated with each rod, each jack separated from each other from a load point of view, and adjusting the height position of the climb rods in relation to each other by means of a respective associated jack in order to minimize the stresses in the object caused by the lifting operation. 
     
     
       2. A method according to claim 1, wherein hydraulic jacks are used and including the step of utilizing the pressure in the hydraulic system of each jack for checking the size of the load acting on the respective jack. 
     
     
       3. A method according to claim 1, including the step of arranging each climb rod on a beam carried by the associated jack and rendering it possible to relieve the jack by trestling.